PCB Repair Logs Wardner

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Wardner

Wardner
Marquee wardner.jpg
Manufacturer Taito
Year 1987
PCB Image Wardner PCB
Pin Out Jamma

Repairer: Womble
Forum Thread: Wardner PCB Repair

Got a pile of boards from Left_jump_left_1P's, three of which were original Taito Wardner boards...

Pcb wardner.jpg

...the first one I fired up did nothing, just a blank screen. Turns out it was a very quick fix, one of the custom chips at E5 (labelled WTC02) was socketed and a slight shadow on one pin mad it look like it was bent under, so I took it off to check, all the pins were fine but I found this...

Pcb repair wardner 2 1.jpg

... someone had slipped when levering the chip out and had not only smashed the socket but ploughed a lump out of the board, which had clearly broken a track to a pin from the via. I could beep through from the torn end of the track to the nearest pin, I could probably have guessed it was that pin but this way I was sure and didn't have to take the socket off.

So a 1cm length of hookup wire soldered in place bridged the gap...

Pcb repair wardner 2 2.jpg

... and the board booted up and ran.

Pcb repair wardner 2 3.jpg

Pcb repair wardner 2 4.jpg

The colours were not right, the blue channel was missing from the RGB out. I could see the colour signals leaving the JAMMA connector on the red, green and sync lines but the blue line was silent.

When the board was powered down I could trace the blue track back to a block of resistors which were fed by a couple of 74ls273, all of which looked fine on the scope. Heading back along the blue track towards the JAMMA connector there was a via which was a handy point to probe, it too looked fine. There was a healthy looking track between the via and the edge connector and when I pressed the probe hard into the blue pad I got a signal, turns out the fault was just a pretty oxidised JAMMA connector, a quick going over with metal polish and the blue signal reappeared.

Pcb repair wardner 2 5.jpg

Pcb repair wardner 2 6.jpg

Board fixed!


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